Aerco Modulex MLX-757 User manual

MC2: 10/03/12 Page 1 of 90

GF-115-H

TAG-0083_0B

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

USER MANUAL

Revised: 10/03/2012

Modulating, Condensing,

Hot Water Boiler Models:

• MLX-303

• MLX-454

• MLX-606

• MLX-757

• MLX-909

• MLX-1060

Modulex MLX Series Boiler

Other manuals for this product include:

• GF-115-C MLX E8 Controller/BCM Manual

• GF-115-E MLX Electrical Power Guide

• GF-115-P-H MLX Piping Guide

• GF-115-V MLX Venting Guide

• GF-115-G MLX Gas Supply Guide

Installation, Operation, and Maintenance

Modulex MLX Series

Gas Fired Boiler

MC2: 10/03/12 Page 2 of 90

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

Disclaimer

The information contained in this manual is subject to change without notice from AERCO International,

Inc. AERCO makes no warranty of any kind with respect to this material, including but not limited to

implied warranties of merchantability and fitness for a particular application. AERCO International is not

liable for errors appearing in this manual. Nor for incidental or consequential damages occurring in

connection with the furnishing, performance, or use of this material.

Technical Support:

(Mon–Fri, 8am-5pm EST)

1-800-526-0288

www.aerco.com

MC2: 10/03/12 Page 3 of 90

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AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

TABLE OF CONTENTS

TABLE OF CONTENTS .................................................................................................................... 3

CHAPTER 1: SAFETY PRECAUTIONS .................................................................................. 7

Important – For Massachusetts Installations .............................................................................. 8

CHAPTER 2: GENERAL DESCRIPTION ............................................................................. 11

2.1 Introduction To Technical Features ............................................................................... 11

2.2 Code and Standards Approvals ...................................................................................... 12

2.3 Installation Flexibility .................................................................................................... 12

2.4 Dimensions and Weights ................................................................................................ 13

2.5 Technical Data................................................................................................................ 15

2.6 Modulex Main Components – Side View ...................................................................... 16

2.7 Boiler Freeze Protection ................................................................................................. 17

CHAPTER 3: INSTALLATION ............................................................................................... 19

3.1 Introduction to Installation ............................................................................................. 19

3.2 Installation Instructions .................................................................................................. 19

3.2.1 Unpacking the Boiler .......................................................................................... 19

3.2.2 Boiler Location .................................................................................................... 21

3.2.3 Pad Height for Boiler .......................................................................................... 21

3.2.4 Boiler Connections .............................................................................................. 22

3.3 Data Plate ....................................................................................................................... 23

CHAPTER 4: GENERAL INFORMATION FOR VENTING .............................................. 25

4.1 Vent Pipe Connection..................................................................................................... 25

4.2 Gas Vent Categories ....................................................................................................... 25

4.3 Installation And Sizing ................................................................................................... 25

4.4 Existing Boiler Removal From Common Venting System ............................................ 26

CHAPTER 5: PIPING ................................................................................................................ 27

5.1 Makeup Water Quality ................................................................................................... 27

5.2 Maximum Allowable Working Pressure ...................................................................... 27

5.3 Boiler Loop Design Guidelines ...................................................................................... 27

5.4 CSD-1 Manifold Assembly (Supplied) .......................................................................... 27

5.5 Connecting Supply And Return Piping (Per ANSI Z21.13a) ........................................ 27

5.6 System Filling and Draining .......................................................................................... 28

5.7 Notes On Condensate Drain ........................................................................................... 28

5.8 Gas Mains and Connections ........................................................................................... 28

CHAPTER 6: ELECTRICAL ................................................................................................... 29

6.1 Electrical Connections.................................................................................................... 29

MC2: 10/03/12 Page 4 of 90

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

6.2 DHW (Domestic Hot Water) Storage Tank ................................................................... 31

6.3 Enable / Disable ............................................................................................................. 31

6.4 Installation Of Sensors ................................................................................................... 31

CHAPTER 7: BOILER OPERATION ..................................................................................... 33

7.1 Introduction to Boiler Operation .................................................................................... 33

7.2 Modulation Theory ......................................................................................................... 33

7.3 Ignition Sequence ........................................................................................................... 33

7.4 Modes of Operation ........................................................................................................ 34

7.4.1 Indoor/Outdoor Reset .......................................................................................... 34

7.4.2 0 To 10 Volt Remote Set-Point ........................................................................... 34

7.4.3 Constant Set-Point ............................................................................................... 34

7.4.4 Boiler Operation for Troubleshooting (Manual Mode)....................................... 34

7.5 Modulex Boiler Initial Startup ....................................................................................... 34

7.5.1 Tools & Instruments Required For Combustion Calibration .............................. 35

7.5.2 Installing the Supply Gas Manometer ................................................................. 35

7.5.3 Preparing The Flue For Use With The Combustion Analyser ............................ 36

7.5.4 Supply Gas Pressure Check & Adjustment ......................................................... 36

7.5.5 Combustion Calibration. ..................................................................................... 38

7.6 Unit Reassembly ............................................................................................................ 40

CHAPTER 8: SAFETY DEVICE TESTING .......................................................................... 41

8.1 Testing of Safety Devices .............................................................................................. 41

8.2 Processing and Clearing Fault Codes ............................................................................. 41

8.3 LOW GAS PRESSURE FAULT TEST......................................................................... 42

8.4 LOW WATER LEVEL FAULT TEST ......................................................................... 43

8.5 WATER TEMPERATURE FAULT TEST ................................................................... 44

8.6 FLAME FAULT TESTS ................................................................................................ 45

8.7 SAFETY PRESSURE RELIEF VALVE TEST ............................................................ 46

CHAPTER 9: MAINTENANCE ............................................................................................... 47

9.1 Modulex Preventative Maintenance Kits ....................................................................... 47

9.1.1 Annual Maintenance Kit ..................................................................................... 47

9.1.2 Fireside Inspection Kit ........................................................................................ 47

9.2 Annual Maintenance Instructions................................................................................... 48

9.2.1 REQUIRED Tasks: ............................................................................................. 48

9.2.2 RECOMMENDED Tasks: .................................................................................. 48

9.2.3 Tools Required .................................................................................................... 48

9.2.4 Replacing the Spark Igniters and Flame Detectors ............................................. 50

9.2.5 Testing the Flame Detection Circuitry ................................................................ 50

9.3 Fireside Inspection Instructions ..................................................................................... 50

MC2: 10/03/12 Page 5 of 90

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

9.3.1 Unit Disassembly for a Fireside Inspection ........................................................ 51

9.3.2 Removing The Burner Modules .......................................................................... 55

9.3.3 Maintenance of Burner Modules and Combustion Chamber .............................. 56

9.3.4 Reassembly After Burner Mainentance .............................................................. 57

9.3.5 Testing the Flame Detection Circuitry ................................................................ 57

9.3.6 Disassembly, Inspection, and Maintenance for the Flue Collector ..................... 57

9.4 Burner Section Replacement Instructions ...................................................................... 59

9.4.1 Disassembly For Burner Section Replacement ................................................... 60

9.4.2 Replacement of Burner Sections ......................................................................... 61

9.4.3 Replacing the Condensate Tray Top Gasket ....................................................... 62

9.4.4 Re-Assembly After Burner Section Replacement ............................................... 64

9.5 Final Testing and Return To Service.............................................................................. 64

CHAPTER 10: TROUBLE SHOOTING GUIDE ................................................................... 65

10.1 Introduction ................................................................................................................ 65

CHAPTER 11: TEMPERATURE SENSOR RESISTANCE CHART.................................. 77

CHAPTER 12: MODULEX PARTS DRAWING AND LIST ................................................ 78

CHAPTER 13: BOILER WATER QUALITY AND MAINTENANCE ............................... 83

13.1 Modulex Boiler Water Chemistry .............................................................................. 84

13.1.1 Reaction of Metals to Water Chemistry .......................................................... 84

13.1.2 Scale and Corrosion ......................................................................................... 84

13.1.3 Make-up or Feed Water Quality ...................................................................... 84

13.1.4 Treating Water to Prevent Freezing................................................................. 84

13.1.5 Water Treatment Certification ......................................................................... 85

13.2 Testing and Maintenance of Water Quality ................................................................ 85

13.3 System Flushing, Treatment, and Cleansing .............................................................. 86

13.4 Water Quality Maintenance and Boiler Warranty ...................................................... 87

13.5 Water Treatment Certification .................................................................................... 87

13.6 Water Treatment Analysis and Scheduling ................................................................ 87

13.7 Hydronic Water Testing and Treatment Resources ................................................... 88

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Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

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AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

CHAPTER 1: SAFETY PRECAUTIONS

The following defined symbols are used throughout this manual to notify the reader of potential hazards of

varying risk levels.

Indicates an imminently hazardous situation, which if not avoided, WILL

result in death or serious injury.

Indicates a potentially hazardous situation, which if not avoided, MAY

result in death or serious injury.

Indicates a potential hazardous situation, which if not avoided, COULD

result in minor or moderate injury. Also may caution against unsafe

practices.

Note that all hazard notifications and notes are presented enclosed in a rectangle with filleted (round)

corners, as shown below, in order to differentiate them from the main text.

It is of utmost importance to observe all CAUTIONS and WARNINGS presented in this manual to avoid

injury, death, and damage to the equipment. Failure to properly heed safety warnings and cautions may

result in the voiding of applicable warranties.

NEVER USE FLAMES TO DETECT GAS LEAKS!

What to do if you smell gas:

• Do NOT try to light or turn on any appliance.

• Do NOT touch any electric switch or open switched doors.

• Do NOT use any phone or intercom device in your building.

• Do NOT touch metal doorknobs or any grounded device or surface without using insulated

gloves or other insulated material if you suspect static charge buildup.

• Immediately call your gas supplier from a neighbor’s phone or, if you are outside, your cell

phone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

This boiler has been built for installation in the country indicated on the

technical data plate. Installation in any other country may be a source

of danger for people, animals and property.

NOTE

Carefully read the warranty conditions and clauses on the warranty

certificate attached to the boiler.

WARNING

!

WARNING

!

WARNING

!

DANGER

!

CAUTION

!

MC2: 10/03/12 Page 8 of 90

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

Important – For Massachusetts Installations

Boiler Installations within the Commonwealth of Massachusetts must conform to the following

requirements:

• Boiler must be installed by a plumber or a gas fitter who is licensed within the Commonwealth of

Massachusetts.

• Prior to unit operation, the complete gas train and all connections must be leak tested using a non-

corrosive soap.

• If a glycol solution is used as anti-freeze protection, a backflow preventer must be installed

upstream of the Fill/Makeup Valve.

• The vent termination must be located a minimum of 4 feet above grade level.

• If side-wall venting is used, the installation must conform to the following requirements extracted

from 248 CMR 5.08 (2):

A. For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or

structure used in whole or in part for residential purposes, including those owned or operated by

the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet

above finished grade in the area of the venting, including but not limited to decks and porches,

the following requirements shall be satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the

side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall

observe that a hard wired carbon monoxide detector with an alarm and battery back-up is

installed on the floor level where the gas equipment is to be installed. In addition, the

installing plumber or gasfitter shall observe that a battery operated or hard wired carbon

monoxide detector with an alarm is installed on each additional level of the dwelling, building

or structure served by the side wall horizontal vented gas fueled equipment. It shall be the

responsibility of the property owner to secure the services of qualified licensed professionals

for the installation of hard wired carbon monoxide detectors

a) In the event that the side wall horizontally vented gas fueled equipment is installed in a

crawl space or an attic, the hard wired carbon monoxide detector with alarm and battery

back-up may be installed on the next adjacent floor level.

b) In the event that the requirements of this subdivision can not be met at the time of

completion of installation, the owner shall have a period of thirty (30) days to comply with

the above requirements; provided, however, that during said thirty (30) day period, a

battery operated carbon monoxide detector with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as

required in accordance with the above provisions shall comply with NFPA 720 and be

ANSI/UL 2034 listed and IAS certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior

of the building at a minimum height of eight (8) feet above grade directly in line with the

exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment.

The sign shall read, in print size no less than one-half (1/2) inch in size, "GAS VENT

DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS".

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled

equipment shall not approve the installation unless, upon inspection, the inspector observes

carbon monoxide detectors and signage installed in accordance with the provisions of 248

CMR 5.08(2)(a)1 through 4.

(Continued on Next Page)

Chap 1: Safety

Precautions

MC2: 10/03/12 Page 9 of 90

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

Important - For Massachusetts Installations

(Continued from Previous Page)

B. EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 to 4:

1. The equipment listed in Chapter 10 entitled "Equipment Not Required To Be Vented" in the

most current edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or

structure separate from the dwelling, building or structure used in whole or in part for

residential purposes.

C. MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED:

When the manufacturer of Product Approved side wall horizontally vented gas equipment

provides a venting system design or venting system components with the equipment, the

instructions provided by the manufacturer for installation of the equipment and the venting system

shall include:

1. Detailed instructions for the installation of the venting system design or the venting system

components; and

2. A complete parts list for the venting system design or venting system.

D. MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT

PROVIDED: When the manufacturer of a Product Approved side wall horizontally vented gas

fueled equipment does not provide the parts for venting the flue gases, but identifies "special

venting systems", the following requirements shall be satisfied by the manufacturer:

1. The identification of each "special venting system" shall include the listing of either the

website, phone number or manufacturer’s address where the venting system installation

instructions can be obtained; and

2. The "special venting systems" shall be Product Approved by the Board, and the

instructions provided with the system shall include a parts list and detailed installation

instructions.

E. A copy of all installation instructions for the Product Approved side wall horizontally vented gas

fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting

design instructions shall remain with the appliance or equipment at the completion of the

installation.

[End of Extracted Information From 248 CMR 5.08 (2)]

Chap 1: Safety

Precautions

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OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

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CHAPTER 2: GENERAL DESCRIPTION

Each AERCO Modulex Boiler is shipped as either a Natural Gas Only

Boiler OR a Propane Gas Only Boiler. It is NOT a Dual-Fuel Boiler.

Ensure that the correct fuel and f

\

2.1 Introduction To Technical Features

Modulex is a compact, modular, gas fired, Low NOx, condensing boiler. The boiler body is comprised of

sections of cast aluminum/magnesium/silicon alloy. The boiler is designed to recover the latent heat of

the combustion gases, thereby allowing it to attain a thermal efficiency of 92% as tested by the

Hydronics Institute, a Division of GAMA. These cast aluminum sections make up modules referred to

as the heat modules. Each module can deliver an output between a maximum of 152 MBH and a

minimum of 45 MBH and are composed of a pre mix combustion chamber, metallic mesh radiant

burner, modulating fan with control pressure switch, gas valve, ignition device, flame detection, NTC

sensor for local temperature control and a safety thermostat.

The heat modules are housed in a single enclosure and are connected to a single exhaust manifold.

These modules are independent of each other and are sequentially staged, a technique known as

cascading, which produces reliable and stable heat at high efficiencies. Each heat module has its own

printed circuit (PC) board that controls and monitors combustion as well as the temperature of each

heat module, providing operational reliability and safety. The entire boiler is controlled by a single

microprocessor. This microprocessor is responsible for the staging and modulation of the heat

modules, monitoring supply and return water temperatures as well as heating and domestic hot water

(DHW) zones. Other features include:

• The heating load is shared with as many boiler modules as possible running at a minimum output to

ensure the maximum efficiency at partial load operation.

• Access to all testing/programming parameters of each module: operation test, operation time, boiler

freeze protection from 45°F (7°C), pump’s anti seize program.

• Lead-lag burner operation based on burner operating hours. The boiler module with the least burner

operating hours is the first to start and the burner with the most operating hours is the first to stop.

• D.H.W. production by a priority sensor, with control capability of a dedicated pump or a 3-way

diverting valve for storage tank temperature control.

• A service mode for manual operation of individual heat modules capability for troubleshooting or

combustion calibration

• Diagnostics including relay and sensor testing.

Reliability is improved by the modular design of the Modulex since each heat module is independent of

the other, having its own ignition and combustion safeguard system. If one of the boiler’s heat modules

stops functioning, the remaining module(s) continue to operate.

The Modulex boiler can be comprised of from 2 to 7 modules and 3 to 8 cast aluminum sections. The

input to each heat module is 151.5 MBTU/Hr. The smallest Modulex 303, comprised of two heat

modules, has a combined total input of 303,000 BTU/Hr (2 x 151.5 = 303 MBTU) while the largest, the

1060 comprised of 7 heat modules has a total input of 1060 MBTU’s (See Table 2-1).

For one Modulex 303 boiler consisting of two modules, the output modulates from 15% to 100%. For a

Modulex 1060 boiler consisting of seven modules, the output modulates from 4.3% and 100%. If a

system comprised of two boilers is installed, then the modulation range for each boiler increases to 7.5%

to 100% for the Modulex 303 and 2.2% to 100% for the Modulex 1060.

CAUTION

!

MC2: 10/03/12 Page 12 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

2.2 Code and Standards Approvals

MODULEX has been reviewed for compliance with the applicable sections of the following North

American Standards:

• Z21.13: Gas fired low pressure steam and hot water boilers.

• ASME SECTION IV: Boiler and pressure vessel code rules for construction of heating

boilers.

• BTS 2000: Testing standard method to determine efficiency of commercial space heating

boilers.

• SCAQMD Rule 1146.2: NOx emissions from water heaters and small boilers.

• CSD-1-2004: Controls and safety devices for automatically fired boilers.

Table 2-1: Modulex Boiler Output Range, Turn-Down Ratio & Condensate Production

Heat

Modules

Model

Output Range MBH

1

(KW)

Turn

Down

Ratio

Condensate Production [gph (l/h)]

Min. Max. Min. Max.

2

MLX-303

41(12)

279 (82)

6:1

1.3 (5)

3.4 (13)

3

MLX-454

41(12)

418 (122)

10:1

1.9 (7.3)

5.3 (20)

4

MLX-606

41(12)

558 (163)

13:1

2.7 (10.1)

7.1 (27)

5

MLX-757

41(12)

696 (204)

16:1

3.3 (12.6)

9.0 (34)

6

MLX-909

41(12)

835 (245)

20:1

4.0 (15.1)

10.6 (40)

7

MLX-1060

41(12)

975 (286)

23:1

4.6 (17.6)

12.4 (47)

1

MBH = 1000 Btu/hr

2.3 Installation Flexibility

The Modulex boiler allows for installation flexibility, i.e. it is suitable to be connected with the water

supply and return and the gas connections on the Right Hand (right-hand) side (standard delivery

condition) or on the Left Hand (left-hand) side. This is accomplished by reversing the gas and water

manifolds utilizing the instructions supplied with the boiler. The same is true for the vent pipe

connection, which at the installation, can be moved from the right-hand side (standard delivery condition)

to the left-hand side or to the rear of the boiler. The installation flexibility features include the following:

• Two or more Modulex boilers may be installed in a multiple boiler system with gas connecting pipes,

supply/return water pipes arranged for connection to either the left or right-hand side of each unit.

The unit is shipped with all connections on the right hand side as viewed from the front of the unit.

• The vent pipe may be installed on the right, the left, or behind the heating system.

NOTE

Installation of the vent behind the unit will require accommodations for

the easy removal of the venting in order to provide service that requires

removal of the rear panel.

MC2: 10/03/12 Page 13 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

2.4 Dimensions and Weights

The dimensions and weights for each Modulex Model are shown in Diagram 1 and 2 of Figure 2-1 and

Table 2-2.

4.33” (110 mm)

12.40”

(315 mm)

4.33” (110 mm)

16.73”

(425 mm)

8.78”

(223 mm)

13.39”

(340 mm)

L

8.78”

(223 mm)

13.39”

(340 mm)

FRONT VIEW

S

10.55” (268 mm)

Ø

13.78”

(350 mm)

13.58

(345 mm)

B

C

TOP VIEW

H

D

B

A

Figure 2-1: Modulex Dimensions and Weights (Diagram 1 of 2)

MC2: 10/03/12 Page 14 of 90

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GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

20.94”

(532 mm)

8.66”

(220 mm)

4.17”

(106 mm)

17.80” (452 mm)

8.35”

(212 mm)

LEFT HAND SIDE VIEW

M

R

G

11.86”

(301 mm)

15.47”

(393 mm)

8.66”

(220 mm)

10.43”

(265 mm)

36.50”

(927 mm)

4.96”

(126 mm)

8.35”

(212 mm)

5.39

17.92” (455 mm)

27.36” (695 mm)

6.90”

(175 mm)

41.46”

(1053 mm)

G

M

R

RIGHT HAND SIDE VIEW

Figure 2-1: Modulex Dimensions and Weights (Diagram 2 of 2)

Table 2-2: Modulex Models Dimensions and Weights

(2 MODULES)

HEIGHT 41.46 (1053)

IN (MM)

WIDTH "L" NET 27.36 (695)

WIDTH W/PACKAGING

30.32 (770)

DEPTH "C" 37.09 (942)

DEPTH "A" 27.36 (695)

DEPTH "B"

32.28 (820)

DEPTH W/PACKAGING

30.71 (780)

NET WEIGHT

LB (KG)

331 (150)

GROSS WEIGHT

LB (KG)

386 (175)

CONNECTION

GAS 1-1/2 (38)

WATER OUTLET (SUPPLY) M 2 (50)

WATER INLET (RETURN) R 2 (50)

EXH. VENT CONNECTION "D" 4 (102)

EXH. VENT WIDTH "H" 9.45 (240)

CONDENSATE DRAIN DIA. 1.57 (40)

27.36 (695)

30.32 (770)

27.36 (695)

32.28 (820)

30.71 (780)

408 (185)

463 (210)

1-1/2 (38)

2 (50)

4 (102)

9.45 (240)

1.57 (40)

32.83 (834) 38.11 (968)

35.7 (908) 41.0 (1042)

37.09 (942)

27.36 (695) 27.36 (695)

32.28 (820) 32.28 (820)

30.71 (780) 30.71 (780)

496 (225) 573 (260)

551 (250) 639 (290)

1-1/2 (38) 1-1/2 (38)

2 (50) 2 (50)

4 (102) 6 (152)

9.45 (240) 9.45 (240)

1.57 (40) 1.57 (40)

43.39 (1102) 48.66 (1236)

46.3 (1176 51.6/1310

27.36 (695) 27.36 (695)

32.28 (820) 32.28 (820)

30.71 (780) 30.71 (780)

672 (305) 761 (345)

739 (335) 827 (375)

1-1/2 (38) 1-1/2 (38)

2 (50) 2 (50)

6 (152) 6 (152)

9.45 (240) 9.45 (240)

1.57 (40) 1.57 (40)

DIMENSIONS

MODULEX MODELS

MLX-303

IN (MM)

(3 MODULES)

(4 MODULES)

(5 MODULES) (6 MODULES) (7 MODULES)

41.46 (1053) 41.46 (1053)

41.46 (1053)

MLX-454 MLX-606 MLX-757

MLX-909

MLX-1060

37.09 (942)

37.09 (942) 37.09 (942)

37.09 (942)

MC2: 10/03/12 Page 15 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

2.5 Technical Data

(The Name Plate is placed under the front jacket next to the control panel.)

MIN/MAX INPUT AND OUTPUT:

Model Number Min Input Max Input Max Output* Net IBR Rating

MLX-303

45,500

303,000

260,000-279,000

237,000

MLX-454

45,500 454,000 390,000-418,000 355,000

MLX-606

45,500 606,000 521,000-558,000 474,000

MLX-757

45,500 757,000 651,000-696,000 592,000

MLX-909

45,500 909,000 835,000-836,000 710,000

MLX-1060

45,500 1,060,000 912,000-975,000 829,000

DIMENSIONS:

Model Number

Height

Width

Depth

Weight

MLX-303

42” (1067 mm)

28” (711 mm)

27” (686 mm)

405 lbs. (183.7 kg)

MLX-454

42” (1067 mm)

28” (711 mm

27” (686 mm)

484 lbs. (219.6 kg)

MLX-606

42” (1067 mm)

33” (838 mm)

27” (686 mm)

575 lbs. (260.8 kg)

MLX-757

42” (1067 mm)

38” (965 mm)

27” (686 mm)

673 lbs. (305.2 kg)

MLX-909

42” (1067 mm)

44” (112 mm)

27” (686 mm)

765 lbs. (346.8 kg)

MLX-1060

42” (1067 mm)

49” (1245 mm)

27” (686 mm)

869 lbs. (394.0 kg)

SPECIFICATIONS:

Model Number

MLX-303

MLX-454

MLX-606

MLX-757

MLX-909

MLX-1060

Boiler Category

IV

Type of Gas

Natural Gas

(MLX-303B)

or Propane

(MLX-303BP)

Natural Gas

(MLX-454B)

or Propane

(MLX-454BP)

Natural Gas

(MLX-606B)

or Propane

(MLX-606BP)

Natural Gas

(MLX-757B)

or Propane

(MLX-757BP)

Natural Gas

(MLX-909B)

or Propane

(MLX-909BP)

Natural Gas

(MLX-1060B)

or Propane

(MLX-

1060BP)

Gas Connections (NPT)

1.5”

Max. Gas Pressure

14” W.C.

(34.8 mbar)

14” W.C.

(34.8 mbar)

14” W.C.

(34.8 mbar)

14” W.C.

(34.8 mbar)

14” W.C.

(34.8 mbar)

14” W.C.

(34.8 mbar)

Optimal Gas Pressure

7” W.C.

(17.4 mbar)

7” W.C.

(17.4 mbar)

7” W.C.

(17.4 mbar)

7” W.C.

(17.4 mbar)

7” W.C.

(17.4 mbar)

7” W.C.

(17.4 mbar)

Min. Gas Pressure

4”

(10 mbar)

4”

(10 mbar)

4”

(10 mbar)

4”

(10 mbar)

4”

(10 mbar)

4”

(10 mbar)

Max. Allowed Working

Pressure

92 psi

(634 kPa)

92 psi

(634 kPa)

92 psi

(634 kPa)

92 psi

(634 kPa)

92 psi

(634 kPa)

92 psi

(634 kPa)

Electrical Req:

120V 15 Amp. Max.

1.2 FLA 1.8 FLA 2.4 FLA 3.0 FLA 3.6 FLA 4.2 FLA

Water Connections

(NPT)

2-1/2” 2-1/2” 2-1/2” 2-1/2” 2-1/2” 2-1/2”

Min. Water Flow (GPM)

11

17

22

28

38

39

Max. Water Flow (GPM)

28

42

55

70

84

98

Water Pressure Drop

@ Max. Flow (Ft. of

Head)

7.8 9.3 9.4 10.0 10.1 10.2

MC2: 10/03/12 Page 16 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

SPECIFICATIONS (Continued):

Model Number

MLX-303

MLX-454

MLX-606

MLX-757

MLX-909

MLX-1060

Water Volume: Gallons 2.8 3.8 4.9 5.9 6.9 8.0

Water Volume: Liters 10.4 14.4 18.4 22.3 26.9 30.2

Thermal Modules 2 3 4 5 6 7

Turn-Down Ratio 6:1 10:1 13:1 16:1 20:1 23:1

Vent Size 4” (102 mm)

4” (102 mm)

4” (102 mm) 6” (152mm) 6” (152mm)

6” (152mm)

Vent Materials (per

local code)

Can support PVC, ABS, CPVC, or AL29-4C venting materials.

Temperature Control

Range

All units can be applied to deliver 50°F to 185°F (10°C to 85°C) supply

water.

Maximum Noise Level All units deliver <50 dBA when operating at or below full fire.

NOx Emissions

Certification

All units have been certified by SCAQMD and TCEQ for <30 ppm NOx.

Standard Listings &

Approvals

All units have been certified by CSA and Standard for Controls and Safety

Devices for Automatically Fired Boilers, ANSI/ASME CSD-1.

2.6 Modulex Main Components – Side View

Figure 2-2 illustrates the Main Components included in each Modulex Boiler model. In addition, an

exploded view parts list drawing is included in Appendix B.

FAN

GAS VALVE

BURNER

COVER

IGNITION

FLAME

DETECTOR

LOCAL NTC

SENSOR

H.L.

THERMOSTAT

BURNER

FILLING-UP

ELBOW

GAS PIPE

AIR INTAKE

CONNECTION

GLOBAL FLOW

NTC TEMPERATURE

SENSOR

HOT WATER

OUTLET (SUPPLY)

1/4" CONNECTION

WITH PLUG

GLOBAL RETURN

NTC TEMPERATURE

SENSOR

COLD WATER INLET

(RETURN)

WATER DRAIN

VALVE

CONDENSATE

DRAIN TRAP

1" [25 mm]

BOILER

FRAME

ALUMINUM/

SILICON HEAT

EXCHANGER

AUTOMATIC

AIR VENT

CONDENSATE

COLLECTION

TRAY MANIFOLD

4"

[100 mm]

5.9" [150 mm]

Figure 2-2: Modulex Main Components

MC2: 10/03/12 Page 17 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

2.7 Boiler Freeze Protection

Should the boiler water outlet temperature decrease to less than 44.6°F (7°C), the system pump will start.

Should temperature decrease to less than 37.4°F (3°C), all heat modules will start at minimum output until

the return temperature reaches 50°F (10°C). Such a protection device is exclusively for the boiler. For the

protection of the whole system, a second freeze protection thermostat is necessary to switch on the

heating system pump.

NOTE

If glycol is used as antifreeze in the boiler, a back flow preventer must be

installed in the make-up/fill line.

MC2: 10/03/12 Page 18 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 2: General

Description

(This page left intentionally blank)

MC2: 10/03/12 Page 19 of 90

GF-115-H

TAG-0083_0B

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

CHAPTER 3: INSTALLATION

3.1 Introduction to Installation

The Modulex Boiler is intended to be installed as a Category IV vent installation and must be installed

in compliance with all applicable laws and regulations including the ones below. See Sub-section 4.2

for category descriptions.

To ensure proper boiler installation, complete ALL instructions in

Section 3.2.

The installation must conform to the requirements of the authority having jurisdiction or, in the absence

of such requirements, to one of the following:

UNITED STATES: Installation must conform to the requirements of the National Fuel Gas Code, ANSI

Z223.1 installation Codes.

CANADA: Installation must conform to the requirements of CAN/CGA CSA B149.1 installation codes.

Where required by the authority having jurisdiction, the installation must conform to the Standard for

Controls and Safety Devices for Automatically Fired Boilers, ANSI/ASME CSD-1.

IMPORTANT NOTE!

Installers must follow local regulations with respect to installation of

Carbon Monoxide (CO) Detectors. Also, follow the maintenance

recommendations in this manual.

For Massachusetts Installations:

The boiler must be installed by a plumber or gas fitter licensed within the

Commonwealth of Massachusetts. For installations in buildings used for

residential purposes, if a side-wall vent termination is less than 7 feet

above grade, an NFPA 720 compliant, ANSI/UL 2034 listed and IAS

certified carbon monoxide detector must be installed on the floor level

where the boiler is installed and on each level of the building served by

the boiler.

3.2 Installation Instructions

The following information in this section provides the instructions to unpack and install the Modulex Boiler.

3.2.1 Unpacking the Boiler

The Modulex Boiler is delivered assembled and protected by a plastic bag inside a rugged

cardboard box, which is fixed on a pallet (see Figure 3-1). The pallet allows the boiler to be handled

by a forklift or pallet jack. The boiler, with the packaging, can fit through a doorway of 32 in. (81 cm),

whereas, without packaging, it can fit through a doorway of 28 in. (71 cm). To unpack the Modulex,

remove both straps and then the cardboard box from above. Check to ensure that the product is

intact.

The packing elements (cardboard box, straps, plastic bags, etc…)

should be kept away from small children as these pose a risk of

suffocation and/or choking.

WARNING

!

WARNING

!

MC2: 10/03/12 Page 20 of 90

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

GF-115-H

OMM-0083_0B

Modulex MLX Series Gas Fired Boiler System

Operation and Maintenance Manual

Chap 3:

Installation

Figure 3-1: Packaged Modulex Boiler

Packed inside the boiler packing you will find:

Painted steel panels:

• The front one connected to the back panel by a shrink wrap film

• The right hand side panel connected to the left hand panel by shrink wrap

On the front of the boiler:

• Flue collector, with exhaust connector screwed to the pallet:

1. 4 inch for models 303 to 606.

2. 6 inch for models 757 to 1060.

Use these items only when the specified flue pipe size is increased to 4” (for models

303 to 606) and 6” (for models 757 to 1060). Otherwise, use the exhaust connector

“shipped in the separate carton” described below (4” for models 303 to 606, 6” for

models 757 to 1060).

• A plastic bag containing 3 gaskets (1 rectangular for condensate tray and flue collector, 1

square for exhaust connector.

• Three (3) surface-mount strap-on sensors.

• Screws necessary for accessory installation.

• Piping for 1 ½” condensate drain, including one tee and two 90 degree elbows.

On the back of the boiler:

• Plastic condensate drainpipe, 38.5 inches (1meter) long, placed under the casing rear

panel.

• Outside air sensor with 49 feet, 2.5 inches (15 m) cable.

• Manual Gas Shutoff Valve.

Shipped in a separate carton are the following:

Accessory kit that includes a CSD-1 installation kit for Models 303 through 606 and Models 754

through 1060 as follows:

• Kit P/N 29073: For Models 303-606 with 50 psig Relief Valve

• Kit P/N 29074: For Models 707-1060 with 50 psig Relief Valve

• Kit P/N 29075: For Models 303-606 with 90 psig Relief Valve

• Kit P/N 29076: For Models 707-1060 with 90 psig Relief Valve

See the packing list shipped in this manual package for a complete listing of accessories. See

paragraph 5.4 for more information about the CSD-1 kits.

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